basic

Sunscreen SPF Protection Time Calculator

Protection time = base burn time × SPF.

Calculates how long sunscreen protects skin from UV-B burns. Multiply your unprotected skin burn time by the SPF factor to get protected time. Remember to reapply every 2 hours.

Priya Venkatesan By Priya Venkatesan
Published Last reviewed 1 min read

Inputs

Results

Enter values and click Calculate to see results.
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How to use this calculator

  1. Fill in the inputs above using the units you already have.
  2. Values update automatically as you type — no submit button needed.
  3. Hover any result row for the underlying formula and intermediate values.

Formula

Protected time (min) = base_burn_min × SPF

In depth

Calculates how long sunscreen protects skin from UV-B burns. Multiply your unprotected skin burn time by the SPF factor to get protected time. Remember to reapply every 2 hours.